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HAT-P-7

HAT-P-7
Données d'observation
(époque J2000.0)
Ascension droite 19h 28m 59,3538s[1]
Déclinaison +47° 58′ 10,2163″[1]
Constellation Cygne
Magnitude apparente 10,5[2]

Localisation dans la constellation : Cygne

(Voir situation dans la constellation : Cygne)
Caractéristiques
Type spectral F6V[3]
Astrométrie
Mouvement propre μα = −18,281 mas/a[1]
μδ = +8,910 mas/a[1]
Parallaxe 2,903 1 ± 0,020 6 mas[1]
Distance 344,459 ± 2,444 2 pc (∼1 120 al)[1]
Caractéristiques physiques
Masse 1,51+0,05
−0,04 M☉[2]
Rayon 2,0+0,02
−0,01 R☉[2]
Température 6 259 ± 32 K[2]
Métallicité [Fe/H] = 0,13[2]
Âge 2,07+0,23
−0,28 a[2]

Désignations

BD+47°2846, Kepler-2, KIC 10666592, 2MASS J19285935+4758102, PPM 58383, GSC 03547-01402, TYC 3547-1402-1[3]

modifier

HAT-P-7, également appelée GSC 03547-01402 ou Kepler-2, est une étoile de type spectral F6 V, sensiblement plus grosse, plus massive et plus chaude que le Soleil, située à environ ∼ 1 120 a.l. (∼ 343 pc)[1] du Système solaire, dans la constellation du Cygne.

Une exoplanète de type Jupiter chaud, appelée HAT-P-7 b, a été détectée le [4] autour de cette étoile par la méthode des transits. Cet astre, qui évolue très près de son étoile parente, aurait une température d'équilibre moyenne en surface d'environ 2 890 °C et présenterait une orbite soit rétrograde soit polaire[5],[6],[7], cette propriété ayant peut-être pour origine un troisième corps, suspecté à partir de variations inexpliquées de la vitesse radiale de l'étoile détectées par effet Doppler-Fizeau, qui pourrait agir par mécanisme de Kozai en générant une résonance orbitale particulière se traduisant par une oscillation de l'inclinaison et de l'excentricité orbitale.

Notes et références

  1. ↑ a b c d e f et g (en) A. G. A. Brown et al. (Gaia collaboration), « Gaia Data Release 2 : Summary of the contents and survey properties », Astronomy & Astrophysics, vol. 616,‎ , article no A1 (DOI 10.1051/0004-6361/201833051, Bibcode 2018A&A...616A...1G, arXiv 1804.09365). Notice Gaia DR2 pour cette source sur VizieR.
  2. ↑ a b c d e et f (en) Exoplanet.eu – 20 mai 2019 « Star: HAT-P-7 ».
  3. ↑ a et b (en) HAT-P-7 sur la base de données Simbad du Centre de données astronomiques de Strasbourg.
  4. ↑ (en) A. Pál, G. Á. Bakos, G. Torres, R. W. Noyes, D. W. Latham, Géza Kovács, G. W. Marcy, D. A. Fischer, R. P. Butler, D. D. Sasselov, B. Sipőcz, G. A. Esquerdo, Gábor Kovács, R. Stefanik, J. Lázár, I. Papp et P. Sári, « HAT-P-7b: An Extremely Hot Massive Planet Transiting a Bright Star in the Kepler Field », The Astrophysical Journal, vol. 680, no 2,‎ , p. 1450-1456 (lire en ligne) DOI 10.1086/588010.
  5. ↑ (en) Joshua N. Winn, John Asher Johnson, Simon Albrecht, Andrew W. Howard, Geoffrey W. Marcy, Ian J. Crossfield et Matthew J. Holman, « HAT-P-7: A RETROGRADE OR POLAR ORBIT, AND A THIRD BODY », The Astrophysical Journal – Letters, vol. 703, no 2,‎ , L99-L103 (lire en ligne) DOI 10.1088/0004-637X/703/2/L99.
  6. ↑ (en) New Scientist – 13 août 2009 « Second backwards planet found, a day after the first ».
  7. ↑ (fr) Futura-Sciences – 17 novembre 2009 « L'étrange orbite de l'exoplanète HAT-P-7b ».

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